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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0433b6768622416faa997de481e5b9cd0b010f254632981ed48537c81016e4' 
  AND token = 'tI+b6mhkIM3WLN8Fw6ayHAbN+W407rRdbWHnKz9Ua70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}